Helical Tiebacks
This is the accepted, code approved method of stabalizing a defective wall. Above is a typical drawing of a basement or retaining wall. If the wall is bent or leaning it will be stabalized so it won’t move in or out. From the right to the left, you can see the helixes at the base of the tieback, then the extension rods, then the threaded rod, then the plate, then the nut and washer. This configuration will secure any failing wall.
Click the image to enlarge.
Helical tiebacks help strengthen and support failing, learning, or bowing basement or retaining walls. we are certified installers of “Chance” helical tiebacks; “Chance” is the brand of helical tiebacks that is recommended by almost all Architects and Engineers.
When we install helical tiebacks, holes must be cut or cored into the existing wall that is bent or leaning.
A hole or depression is dug on the opposite side of the wall to make room for the starter section of the helical tieback.
Helical Tiebacks start with a 1½ inch square solid steel shaft. This shaft has 3 helixes welded to the shaft. One of the helix is near the end of the shaft, the 2ndhelix is approximately 2 feet away on the same shaft, the 3rd helix is another 2 feet up the shaft. This shaft which looks like a large screw, it is screwed into the ground at a slight angle downward, powered by the hydraulics of a piece of heavy equipment such a backhoe, or a large bobcat
A hole or depression is dug on the opposite side of the wall to make room for the starter section of the helical tieback.
Helical Tiebacks start with a 1½ inch square solid steel shaft. This shaft has 3 helixes welded to the shaft. One of the helix is near the end of the shaft, the 2ndhelix is approximately 2 feet away on the same shaft, the 3rd helix is another 2 feet up the shaft. This shaft which looks like a large screw, it is screwed into the ground at a slight angle downward, powered by the hydraulics of a piece of heavy equipment such a backhoe, or a large bobcat
When the first section of the shaft is in the ground a second 1½ inch shaft is fitted and bolted onto the first section and it is screwed into the ground. This process is repeated until resistance that is generated is approximately 3000 psi. A threaded extension is placed on the end of the shaft or helical tieback and is extended through the defective wall where a large plate with a 2 inch hole in the center is placed over the threaded rod and against the wall. Then using a nut and washer tighten the large plate against the wall.
At this point the pressure of the wall is transferred onto the helical tieback. When all the necessary tiebacks are installed the repaired section of the wall will be permanently stabilized.
Dirt is put back in the holes that were dug out for the helical tiebacks. The ground is smoothed and prepared for grass or shrubbery. If concrete is removed we will replace same sections with new concrete.
The number of helical tiebacks needed is determined by careful examination of the defective wall by a representative of “Chance” Helical Tiebacks. Our guarantee is only for the repaired section of the wall.
Normally the depth of the tiebacks is about 18 to 20 feet deep to reach the desired resistance pressure. In determining a price for each helical pier we have figured each pier to be approximately 21 feet into the undisturbed surrounding soil. If the area here happens to be unusual soil and we have to go deeper to reach the desired resistance pressure
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3009 Mount Paran Church Road
Monroe, GA 30655
404.825.3561